This is a driver for Sensirion SHT3x temperature and humidity sensors
connected via I2C.
This commit is a rebasing and contains some interface changes based on
the review from @ourairquality.
SHT3x driver changes
- additional include to satisfy the Travis CI test build
- README.md has been shortened
- special handling for the timer overflow in sht3x_is_measuring removed
- some whitespaces removed
- crc8 computation changed to a non table lookup version
- measurement duration is now given in ticks and can be used directly
for vTaskDelay (documentation and examples changed accordingly)
- number of ticks for measurement duration takes now into account
portTICK_PERIOD_MS
- clock stretching disabled on sensor to avoid blocking when data are
not ready to read
- calculation of maesurement duration adds now one and a half ticks to
be sure that measurement duration is not too short
- function sht3x_is_measuring is now private and only for internal use,
user task has always to use function vTaskDelay to wait for
measurement results
- function sht3x_is_measuring was simplified and returns now just a
boolean value
- private function sht3x_reset added which is used to reset the sensor
during initialization
- active flag in sensor data structure not needed anymore
- function sht3_get_raw_data simplified
- function sht3x_start_measurement returns now only a boolean
- function sht3x_start_measurement does not check anymore whether there is
already a measurment running
- new function sht3x_get_measurement_duration which returns the measurement
duration in ticks for configured repeatability
b8c22d2d21